Validated helioseismic inversions for 3D vector flows
نویسندگان
چکیده
منابع مشابه
Equation of state and helioseismic inversions
Inversions to determine the squared isothermal sound speed and density within the Sun often use the helium abundance Y as the second parameter. This requires the explicit use of the equation of state (EOS), thus potentially leading to systematic errors in the results if the equations of state of the reference model and the Sun are not the same. We demonstrate how this potential error can be sup...
متن کاملEquation of State Effects in Helioseismic Inversions
Solar oscillation frequencies can be inverted to determine the internal structure of the Sun. Frequency diierences between a solar model and the Sun can be related to diierences in the structure by linearizing the oscillation equations. Thus, we can write : (1) (cf. Dziembowski et al. 1990). Here ! i is the difference in the frequency ! i of the ith mode between the solar data and a reference m...
متن کاملLetter to the Editor Equation of state and helioseismic inversions
Inversions to determine the squared isothermal sound speed anddensitywithin theSunoften use the heliumabundance Y as the second parameter. This requires the explicit use of the equation of state (EOS), thus potentially leading to systematic errors in the results if the equations of state of the reference model and the Sun are not the same. We demonstrate how this potential error can be suppress...
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Ring-diagram analysis is a technique of local helioseismology used to infer plasma flows in the solar convection zone which generates intermediate data products known as ring-fitting parameters. Knowing the sensitivity of ringfitting parameters to actual flows in the Sun is important for interpreting these measurements.Working in plane-parallel geometry, we compute the linear sensitivity of rin...
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هدف از این تحقیق، ارزیابی و بهبود متریک های موجود جهت تایید صحت نقشه های قدیمی سه بعدی برداری با استفاده از ابر نقطه حاصل از لیزر اسکن جدید شهر اصفهان می باشد . بنابراین ابر نقطه حاصل از لیزر اسکنر با چگالی حدودا سه نقطه در هر متر مربع جهت شناسایی عوارض تغییر کرده در نقشه های قدیمی سه بعدی استفاده شده است. تمرکز ما در این تحقیق بر روی ساختمان به عنوان یکی از اصلی ترین عارضه های شهری می باشد. من...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2011
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201016426